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    <li><a href="#method-i-number_to_currency">#number_to_currency</a>
    
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<div id="documentation">
  <h1 class="module">module ActionView::Helpers::NumberHelper</h1>

  <div id="description" class="description">
    
<p>Provides methods for converting numbers into formatted strings. Methods are
provided for phone numbers, currency, percentage, precision, positional
notation, file size and pretty printing.</p>

<p>Most methods expect a <code>number</code> argument, and will return it
unchanged if can’t be converted into a valid number.</p>

  </div><!-- description -->

  
  
  
  <section id="5Buntitled-5D" class="documentation-section">
    

    

    
    <!-- Constants -->
    <section id="constants-list" class="section">
      <h3 class="section-header">Constants</h3>
      <dl>
      
        <dt id="DECIMAL_UNITS">DECIMAL_UNITS
        
        <dd class="description">
        
      
        <dt id="DEFAULT_CURRENCY_VALUES">DEFAULT_CURRENCY_VALUES
        
        <dd class="description">
        
      
        <dt id="STORAGE_UNITS">STORAGE_UNITS
        
        <dd class="description">
        
      
      </dl>
    </section>
    

    

    <!-- Methods -->
    
     <section id="public-instance-5Buntitled-5D-method-details" class="method-section section">
      <h3 class="section-header">Public Instance Methods</h3>

    
      <div id="method-i-number_to_currency" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">number_to_currency</span><span
            class="method-args">(number, options = {})</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Formats a <code>number</code> into a currency string (e.g., $13.65). You
can customize the format in the <code>options</code> hash.</p>

<h4 id="method-i-number_to_currency-label-Options">Options</h4>
<ul><li>
<p><code>:locale</code> - Sets the locale to be used for formatting (defaults
to current locale).</p>
</li><li>
<p><code>:precision</code> - Sets the level of precision (defaults to 2).</p>
</li><li>
<p><code>:unit</code> - Sets the denomination of the currency (defaults to
"$").</p>
</li><li>
<p><code>:separator</code> - Sets the separator between the units (defaults to
".").</p>
</li><li>
<p><code>:delimiter</code> - Sets the thousands delimiter (defaults to ",").</p>
</li><li>
<p><code>:format</code> - Sets the format for non-negative numbers (defaults
to "%u%n").  Fields are <code>%u</code> for the currency, and
<code>%n</code> for the number.</p>
</li><li>
<p><code>:negative_format</code> - Sets the format for negative numbers
(defaults to prepending an hyphen to the formatted number given by
<code>:format</code>).  Accepts the same fields than <code>:format</code>,
except <code>%n</code> is here the absolute value of the number.</p>
</li><li>
<p><code>:raise</code> - If true, raises <code>InvalidNumberError</code> when
the argument is invalid.</p>
</li></ul>

<h4 id="method-i-number_to_currency-label-Examples">Examples</h4>

<pre class="ruby"><span class="ruby-identifier">number_to_currency</span>(<span class="ruby-value">1234567890.50</span>)                    <span class="ruby-comment"># =&gt; $1,234,567,890.50</span>
<span class="ruby-identifier">number_to_currency</span>(<span class="ruby-value">1234567890.506</span>)                   <span class="ruby-comment"># =&gt; $1,234,567,890.51</span>
<span class="ruby-identifier">number_to_currency</span>(<span class="ruby-value">1234567890.506</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">3</span>)  <span class="ruby-comment"># =&gt; $1,234,567,890.506</span>
<span class="ruby-identifier">number_to_currency</span>(<span class="ruby-value">1234567890.506</span>, :<span class="ruby-identifier">locale</span> =<span class="ruby-operator">&gt;</span> :<span class="ruby-identifier">fr</span>)   <span class="ruby-comment"># =&gt; 1 234 567 890,51 €</span>
<span class="ruby-identifier">number_to_currency</span>(<span class="ruby-string">&quot;123a456&quot;</span>)                        <span class="ruby-comment"># =&gt; $123a456</span>

<span class="ruby-identifier">number_to_currency</span>(<span class="ruby-string">&quot;123a456&quot;</span>, :<span class="ruby-identifier">raise</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)        <span class="ruby-comment"># =&gt; InvalidNumberError</span>

<span class="ruby-identifier">number_to_currency</span>(<span class="ruby-value">-1234567890.50</span>, :<span class="ruby-identifier">negative_format</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;(%u%n)&quot;</span>)
<span class="ruby-comment"># =&gt; ($1,234,567,890.50)</span>
<span class="ruby-identifier">number_to_currency</span>(<span class="ruby-value">1234567890.50</span>, :<span class="ruby-identifier">unit</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;&amp;pound;&quot;</span>, :<span class="ruby-identifier">separator</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;,&quot;</span>, :<span class="ruby-identifier">delimiter</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;&quot;</span>)
<span class="ruby-comment"># =&gt; &amp;pound;1234567890,50</span>
<span class="ruby-identifier">number_to_currency</span>(<span class="ruby-value">1234567890.50</span>, :<span class="ruby-identifier">unit</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;&amp;pound;&quot;</span>, :<span class="ruby-identifier">separator</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;,&quot;</span>, :<span class="ruby-identifier">delimiter</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;&quot;</span>, :<span class="ruby-identifier">format</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;%n %u&quot;</span>)
<span class="ruby-comment"># =&gt; 1234567890,50 &amp;pound;</span>
</pre>
          

          
          <div class="method-source-code" id="number_to_currency-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.2.7/lib/action_view/helpers/number_helper.rb, line 133</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">number_to_currency</span>(<span class="ruby-identifier">number</span>, <span class="ruby-identifier">options</span> = {})
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">number</span>

  <span class="ruby-identifier">options</span>.<span class="ruby-identifier">symbolize_keys!</span>

  <span class="ruby-identifier">defaults</span>  = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">currency</span>  = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.currency.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">currency</span>[<span class="ruby-value">:negative_format</span>] <span class="ruby-operator">||=</span> <span class="ruby-string">&quot;-&quot;</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">currency</span>[<span class="ruby-value">:format</span>] <span class="ruby-keyword">if</span> <span class="ruby-identifier">currency</span>[<span class="ruby-value">:format</span>]

  <span class="ruby-identifier">defaults</span>  = <span class="ruby-constant">DEFAULT_CURRENCY_VALUES</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-identifier">defaults</span>).<span class="ruby-identifier">merge!</span>(<span class="ruby-identifier">currency</span>)
  <span class="ruby-identifier">defaults</span>[<span class="ruby-value">:negative_format</span>] = <span class="ruby-string">&quot;-&quot;</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:format</span>] <span class="ruby-keyword">if</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:format</span>]
  <span class="ruby-identifier">options</span>   = <span class="ruby-identifier">defaults</span>.<span class="ruby-identifier">merge!</span>(<span class="ruby-identifier">options</span>)

  <span class="ruby-identifier">unit</span>      = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-value">:unit</span>)
  <span class="ruby-identifier">format</span>    = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-value">:format</span>)

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_f</span> <span class="ruby-operator">&lt;</span> <span class="ruby-value">0</span>
    <span class="ruby-identifier">format</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-value">:negative_format</span>)
    <span class="ruby-identifier">number</span> = <span class="ruby-identifier">number</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-string">&quot;abs&quot;</span>) <span class="ruby-operator">?</span> <span class="ruby-identifier">number</span>.<span class="ruby-identifier">abs</span> <span class="ruby-operator">:</span> <span class="ruby-identifier">number</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp">%r^-/</span>, <span class="ruby-string">''</span>)
  <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">begin</span>
    <span class="ruby-identifier">value</span> = <span class="ruby-identifier">number_with_precision</span>(<span class="ruby-identifier">number</span>, <span class="ruby-identifier">options</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-value">:raise</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>))
    <span class="ruby-identifier">format</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r%n/</span>, <span class="ruby-identifier">value</span>).<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r%u/</span>, <span class="ruby-identifier">unit</span>).<span class="ruby-identifier">html_safe</span>
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">InvalidNumberError</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">e</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:raise</span>]
      <span class="ruby-identifier">raise</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">formatted_number</span> = <span class="ruby-identifier">format</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r%n/</span>, <span class="ruby-identifier">e</span>.<span class="ruby-identifier">number</span>).<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r%u/</span>, <span class="ruby-identifier">unit</span>)
      <span class="ruby-identifier">e</span>.<span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">html_safe?</span> <span class="ruby-operator">?</span> <span class="ruby-identifier">formatted_number</span>.<span class="ruby-identifier">html_safe</span> <span class="ruby-operator">:</span> <span class="ruby-identifier">formatted_number</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

<span class="ruby-keyword">end</span></pre>
          </div><!-- number_to_currency-source -->
          
        </div>

        

        
      </div><!-- number_to_currency-method -->

    
      <div id="method-i-number_to_human" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">number_to_human</span><span
            class="method-args">(number, options = {})</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Pretty prints (formats and approximates) a number in a way it is more
readable by humans (eg.: 1200000000 becomes “1.2 Billion”). This is useful
for numbers that can get very large (and too hard to read).</p>

<p>See <code>number_to_human_size</code> if you want to print a file size.</p>

<p>You can also define you own unit-quantifier names if you want to use other
decimal units (eg.: 1500 becomes “1.5 kilometers”, 0.150 becomes “150
milliliters”, etc). You may define a wide range of unit quantifiers, even
fractional ones (centi, deci, mili, etc).</p>

<h4 id="method-i-number_to_human-label-Options">Options</h4>
<ul><li>
<p><code>:locale</code> - Sets the locale to be used for formatting (defaults
to current locale).</p>
</li><li>
<p><code>:precision</code> - Sets the precision of the number (defaults to 3).</p>
</li><li>
<p><code>:significant</code> - If <code>true</code>, precision will be the #
of significant_digits. If <code>false</code>, the # of fractional digits
(defaults to <code>true</code>)</p>
</li><li>
<p><code>:separator</code> - Sets the separator between the fractional and
integer digits (defaults to ".").</p>
</li><li>
<p><code>:delimiter</code> - Sets the thousands delimiter (defaults to "").</p>
</li><li>
<p><code>:strip_insignificant_zeros</code> - If <code>true</code> removes
insignificant zeros after the decimal separator (defaults to
<code>true</code>)</p>
</li><li>
<p><code>:units</code> - A <a href="../../Hash.html">Hash</a> of unit
quantifier names. Or a string containing an i18n scope where to find this
hash. It might have the following keys:</p>
<ul><li>
<p><strong>integers</strong>: <code>:unit</code>, <code>:ten</code>,
*<code>:hundred</code>, <code>:thousand</code>, <code>:million</code>,
*<code>:billion</code>, <code>:trillion</code>, *<code>:quadrillion</code></p>
</li><li>
<p><strong>fractionals</strong>: <code>:deci</code>, <code>:centi</code>,
*<code>:mili</code>, <code>:micro</code>, <code>:nano</code>,
*<code>:pico</code>, <code>:femto</code></p>
</li></ul>
</li><li>
<p><code>:format</code> - Sets the format of the output string (defaults to
"%n %u"). The field types are:</p>
<ul><li>
<p>%u - The quantifier (ex.: ‘thousand’)</p>
</li><li>
<p>%n - The number</p>
</li></ul>
</li><li>
<p><code>:raise</code> - If true, raises <code>InvalidNumberError</code> when
the argument is invalid.</p>
</li></ul>

<h4 id="method-i-number_to_human-label-Examples">Examples</h4>

<pre class="ruby"><span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">123</span>)                                          <span class="ruby-comment"># =&gt; &quot;123&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">1234</span>)                                         <span class="ruby-comment"># =&gt; &quot;1.23 Thousand&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">12345</span>)                                        <span class="ruby-comment"># =&gt; &quot;12.3 Thousand&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">1234567</span>)                                      <span class="ruby-comment"># =&gt; &quot;1.23 Million&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">1234567890</span>)                                   <span class="ruby-comment"># =&gt; &quot;1.23 Billion&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">1234567890123</span>)                                <span class="ruby-comment"># =&gt; &quot;1.23 Trillion&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">1234567890123456</span>)                             <span class="ruby-comment"># =&gt; &quot;1.23 Quadrillion&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">1234567890123456789</span>)                          <span class="ruby-comment"># =&gt; &quot;1230 Quadrillion&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">489939</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">2</span>)                      <span class="ruby-comment"># =&gt; &quot;490 Thousand&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">489939</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">4</span>)                      <span class="ruby-comment"># =&gt; &quot;489.9 Thousand&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">1234567</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">4</span>,
                         :<span class="ruby-identifier">significant</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">false</span>)               <span class="ruby-comment"># =&gt; &quot;1.2346 Million&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">1234567</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">1</span>,
                         :<span class="ruby-identifier">separator</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">','</span>,
                         :<span class="ruby-identifier">significant</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">false</span>)               <span class="ruby-comment"># =&gt; &quot;1,2 Million&quot;</span>
</pre>

<p>Non-significant zeros after the decimal separator are stripped out by
default (set <code>:strip_insignificant_zeros</code> to <code>false</code>
to change that):</p>

<pre class="ruby"><span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">12345012345</span>, :<span class="ruby-identifier">significant_digits</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">6</span>)       <span class="ruby-comment"># =&gt; &quot;12.345 Billion&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">500000000</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">5</span>)                  <span class="ruby-comment"># =&gt; &quot;500 Million&quot;</span>
</pre>

<h4 id="method-i-number_to_human-label-Custom+Unit+Quantifiers">Custom Unit Quantifiers</h4>

<p>You can also use your own custom unit quantifiers:</p>

<pre class="ruby"><span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">500000</span>, :<span class="ruby-identifier">units</span> =<span class="ruby-operator">&gt;</span> {:<span class="ruby-identifier">unit</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;ml&quot;</span>, :<span class="ruby-identifier">thousand</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;lt&quot;</span>})  <span class="ruby-comment"># =&gt; &quot;500 lt&quot;</span>
</pre>

<p>If in your <a href="../../I18n.html">I18n</a> locale you have:</p>

<pre>distance:
  centi:
    one: &quot;centimeter&quot;
    other: &quot;centimeters&quot;
  unit:
    one: &quot;meter&quot;
    other: &quot;meters&quot;
  thousand:
    one: &quot;kilometer&quot;
    other: &quot;kilometers&quot;
  billion: &quot;gazillion-distance&quot;</pre>

<p>Then you could do:</p>

<pre class="ruby"><span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">543934</span>, :<span class="ruby-identifier">units</span> =<span class="ruby-operator">&gt;</span> :<span class="ruby-identifier">distance</span>)                              <span class="ruby-comment"># =&gt; &quot;544 kilometers&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">54393498</span>, :<span class="ruby-identifier">units</span> =<span class="ruby-operator">&gt;</span> :<span class="ruby-identifier">distance</span>)                            <span class="ruby-comment"># =&gt; &quot;54400 kilometers&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">54393498000</span>, :<span class="ruby-identifier">units</span> =<span class="ruby-operator">&gt;</span> :<span class="ruby-identifier">distance</span>)                         <span class="ruby-comment"># =&gt; &quot;54.4 gazillion-distance&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">343</span>, :<span class="ruby-identifier">units</span> =<span class="ruby-operator">&gt;</span> :<span class="ruby-identifier">distance</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">1</span>)                <span class="ruby-comment"># =&gt; &quot;300 meters&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">1</span>, :<span class="ruby-identifier">units</span> =<span class="ruby-operator">&gt;</span> :<span class="ruby-identifier">distance</span>)                                   <span class="ruby-comment"># =&gt; &quot;1 meter&quot;</span>
<span class="ruby-identifier">number_to_human</span>(<span class="ruby-value">0.34</span>, :<span class="ruby-identifier">units</span> =<span class="ruby-operator">&gt;</span> :<span class="ruby-identifier">distance</span>)                                <span class="ruby-comment"># =&gt; &quot;34 centimeters&quot;</span>
</pre>
          

          
          <div class="method-source-code" id="number_to_human-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.2.7/lib/action_view/helpers/number_helper.rb, line 552</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">number_to_human</span>(<span class="ruby-identifier">number</span>, <span class="ruby-identifier">options</span> = {})
  <span class="ruby-identifier">options</span>.<span class="ruby-identifier">symbolize_keys!</span>

  <span class="ruby-identifier">number</span> = <span class="ruby-keyword">begin</span>
    <span class="ruby-constant">Float</span>(<span class="ruby-identifier">number</span>)
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-constant">TypeError</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:raise</span>]
      <span class="ruby-identifier">raise</span> <span class="ruby-constant">InvalidNumberError</span>, <span class="ruby-identifier">number</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-keyword">return</span> <span class="ruby-identifier">number</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">defaults</span> = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">human</span>    = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.human.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">defaults</span> = <span class="ruby-identifier">defaults</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-identifier">human</span>)

  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">reverse_merge</span>(<span class="ruby-identifier">defaults</span>)
  <span class="ruby-comment">#for backwards compatibility with those that didn't add strip_insignificant_zeros to their locale files</span>
  <span class="ruby-identifier">options</span>[<span class="ruby-value">:strip_insignificant_zeros</span>] = <span class="ruby-keyword">true</span> <span class="ruby-keyword">if</span> <span class="ruby-keyword">not</span> <span class="ruby-identifier">options</span>.<span class="ruby-identifier">key?</span>(<span class="ruby-value">:strip_insignificant_zeros</span>)

  <span class="ruby-identifier">inverted_du</span> = <span class="ruby-constant">DECIMAL_UNITS</span>.<span class="ruby-identifier">invert</span>

  <span class="ruby-identifier">units</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">delete</span> <span class="ruby-value">:units</span>
  <span class="ruby-identifier">unit_exponents</span> = <span class="ruby-keyword">case</span> <span class="ruby-identifier">units</span>
  <span class="ruby-keyword">when</span> <span class="ruby-constant">Hash</span>
    <span class="ruby-identifier">units</span>
  <span class="ruby-keyword">when</span> <span class="ruby-constant">String</span>, <span class="ruby-constant">Symbol</span>
    <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:&quot;#{units}&quot;</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:raise</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)
  <span class="ruby-keyword">when</span> <span class="ruby-keyword">nil</span>
    <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:&quot;number.human.decimal_units.units&quot;</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:raise</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">raise</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-string">&quot;:units must be a Hash or String translation scope.&quot;</span>
  <span class="ruby-keyword">end</span>.<span class="ruby-identifier">keys</span>.<span class="ruby-identifier">map</span>{<span class="ruby-operator">|</span><span class="ruby-identifier">e_name</span><span class="ruby-operator">|</span> <span class="ruby-identifier">inverted_du</span>[<span class="ruby-identifier">e_name</span>] }.<span class="ruby-identifier">sort_by</span>{<span class="ruby-operator">|</span><span class="ruby-identifier">e</span><span class="ruby-operator">|</span> <span class="ruby-operator">-</span><span class="ruby-identifier">e</span>}

  <span class="ruby-identifier">number_exponent</span> = <span class="ruby-identifier">number</span> <span class="ruby-operator">!=</span> <span class="ruby-value">0</span> <span class="ruby-operator">?</span> <span class="ruby-constant">Math</span>.<span class="ruby-identifier">log10</span>(<span class="ruby-identifier">number</span>.<span class="ruby-identifier">abs</span>).<span class="ruby-identifier">floor</span> <span class="ruby-operator">:</span> <span class="ruby-value">0</span>
  <span class="ruby-identifier">display_exponent</span> = <span class="ruby-identifier">unit_exponents</span>.<span class="ruby-identifier">find</span>{ <span class="ruby-operator">|</span><span class="ruby-identifier">e</span><span class="ruby-operator">|</span> <span class="ruby-identifier">number_exponent</span> <span class="ruby-operator">&gt;=</span> <span class="ruby-identifier">e</span> } <span class="ruby-operator">||</span> <span class="ruby-value">0</span>
  <span class="ruby-identifier">number</span>  <span class="ruby-operator">/=</span> <span class="ruby-value">10</span> <span class="ruby-operator">**</span> <span class="ruby-identifier">display_exponent</span>

  <span class="ruby-identifier">unit</span> = <span class="ruby-keyword">case</span> <span class="ruby-identifier">units</span>
  <span class="ruby-keyword">when</span> <span class="ruby-constant">Hash</span>
    <span class="ruby-identifier">units</span>[<span class="ruby-constant">DECIMAL_UNITS</span>[<span class="ruby-identifier">display_exponent</span>]]
  <span class="ruby-keyword">when</span> <span class="ruby-constant">String</span>, <span class="ruby-constant">Symbol</span>
    <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:&quot;#{units}.#{DECIMAL_UNITS[display_exponent]}&quot;</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:count</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_i</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:&quot;number.human.decimal_units.units.#{DECIMAL_UNITS[display_exponent]}&quot;</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:count</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_i</span>)
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">decimal_format</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:format</span>] <span class="ruby-operator">||</span> <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.human.decimal_units.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;%n %u&quot;</span>)
  <span class="ruby-identifier">formatted_number</span> = <span class="ruby-identifier">number_with_precision</span>(<span class="ruby-identifier">number</span>, <span class="ruby-identifier">options</span>)
  <span class="ruby-identifier">decimal_format</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r%n/</span>, <span class="ruby-identifier">formatted_number</span>).<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r%u/</span>, <span class="ruby-identifier">unit</span>).<span class="ruby-identifier">strip</span>.<span class="ruby-identifier">html_safe</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- number_to_human-source -->
          
        </div>

        

        
      </div><!-- number_to_human-method -->

    
      <div id="method-i-number_to_human_size" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">number_to_human_size</span><span
            class="method-args">(number, options = {})</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Formats the bytes in <code>number</code> into a more understandable
representation (e.g., giving it 1500 yields 1.5 KB). This method is useful
for reporting file sizes to users. You can customize the format in the
<code>options</code> hash.</p>

<p>See <code>number_to_human</code> if you want to pretty-print a generic
number.</p>

<h4 id="method-i-number_to_human_size-label-Options">Options</h4>
<ul><li>
<p><code>:locale</code> - Sets the locale to be used for formatting (defaults
to current locale).</p>
</li><li>
<p><code>:precision</code> - Sets the precision of the number (defaults to 3).</p>
</li><li>
<p><code>:significant</code> - If <code>true</code>, precision will be the #
of significant_digits. If <code>false</code>, the # of fractional digits
(defaults to <code>true</code>)</p>
</li><li>
<p><code>:separator</code> - Sets the separator between the fractional and
integer digits (defaults to ".").</p>
</li><li>
<p><code>:delimiter</code> - Sets the thousands delimiter (defaults to "").</p>
</li><li>
<p><code>:strip_insignificant_zeros</code> - If <code>true</code> removes
insignificant zeros after the decimal separator (defaults to
<code>true</code>)</p>
</li><li>
<p><code>:prefix</code> - If <code>:si</code> formats the number using the SI
prefix (defaults to :binary)</p>
</li><li>
<p><code>:raise</code> - If true, raises <code>InvalidNumberError</code> when
the argument is invalid.</p>
</li></ul>

<h4 id="method-i-number_to_human_size-label-Examples">Examples</h4>

<pre class="ruby"><span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">123</span>)                                          <span class="ruby-comment"># =&gt; 123 Bytes</span>
<span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">1234</span>)                                         <span class="ruby-comment"># =&gt; 1.21 KB</span>
<span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">12345</span>)                                        <span class="ruby-comment"># =&gt; 12.1 KB</span>
<span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">1234567</span>)                                      <span class="ruby-comment"># =&gt; 1.18 MB</span>
<span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">1234567890</span>)                                   <span class="ruby-comment"># =&gt; 1.15 GB</span>
<span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">1234567890123</span>)                                <span class="ruby-comment"># =&gt; 1.12 TB</span>
<span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">1234567</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">2</span>)                     <span class="ruby-comment"># =&gt; 1.2 MB</span>
<span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">483989</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">2</span>)                      <span class="ruby-comment"># =&gt; 470 KB</span>
<span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">1234567</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">2</span>, :<span class="ruby-identifier">separator</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">','</span>)  <span class="ruby-comment"># =&gt; 1,2 MB</span>
</pre>

<p>Non-significant zeros after the fractional separator are stripped out by
default (set <code>:strip_insignificant_zeros</code> to <code>false</code>
to change that):</p>

<pre class="ruby"><span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">1234567890123</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">5</span>)        <span class="ruby-comment"># =&gt; &quot;1.1229 TB&quot;</span>
<span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-value">524288000</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">5</span>)            <span class="ruby-comment"># =&gt; &quot;500 MB&quot;</span>
</pre>
          

          
          <div class="method-source-code" id="number_to_human_size-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.2.7/lib/action_view/helpers/number_helper.rb, line 409</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">number_to_human_size</span>(<span class="ruby-identifier">number</span>, <span class="ruby-identifier">options</span> = {})
  <span class="ruby-identifier">options</span>.<span class="ruby-identifier">symbolize_keys!</span>

  <span class="ruby-identifier">number</span> = <span class="ruby-keyword">begin</span>
    <span class="ruby-constant">Float</span>(<span class="ruby-identifier">number</span>)
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-constant">TypeError</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:raise</span>]
      <span class="ruby-identifier">raise</span> <span class="ruby-constant">InvalidNumberError</span>, <span class="ruby-identifier">number</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-keyword">return</span> <span class="ruby-identifier">number</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">defaults</span> = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">human</span>    = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.human.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">defaults</span> = <span class="ruby-identifier">defaults</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-identifier">human</span>)

  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">reverse_merge</span>(<span class="ruby-identifier">defaults</span>)
  <span class="ruby-comment">#for backwards compatibility with those that didn't add strip_insignificant_zeros to their locale files</span>
  <span class="ruby-identifier">options</span>[<span class="ruby-value">:strip_insignificant_zeros</span>] = <span class="ruby-keyword">true</span> <span class="ruby-keyword">if</span> <span class="ruby-keyword">not</span> <span class="ruby-identifier">options</span>.<span class="ruby-identifier">key?</span>(<span class="ruby-value">:strip_insignificant_zeros</span>)

  <span class="ruby-identifier">storage_units_format</span> = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.human.storage_units.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:raise</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)

  <span class="ruby-identifier">base</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:prefix</span>] <span class="ruby-operator">==</span> <span class="ruby-value">:si</span> <span class="ruby-operator">?</span> <span class="ruby-value">1000</span> <span class="ruby-operator">:</span> <span class="ruby-value">1024</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_i</span> <span class="ruby-operator">&lt;</span> <span class="ruby-identifier">base</span>
    <span class="ruby-identifier">unit</span> = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.human.storage_units.units.byte'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:count</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_i</span>, <span class="ruby-value">:raise</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)
    <span class="ruby-identifier">storage_units_format</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r%n/</span>, <span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_i</span>.<span class="ruby-identifier">to_s</span>).<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r%u/</span>, <span class="ruby-identifier">unit</span>).<span class="ruby-identifier">html_safe</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">max_exp</span>  = <span class="ruby-constant">STORAGE_UNITS</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>
    <span class="ruby-identifier">exponent</span> = (<span class="ruby-constant">Math</span>.<span class="ruby-identifier">log</span>(<span class="ruby-identifier">number</span>) <span class="ruby-operator">/</span> <span class="ruby-constant">Math</span>.<span class="ruby-identifier">log</span>(<span class="ruby-identifier">base</span>)).<span class="ruby-identifier">to_i</span> <span class="ruby-comment"># Convert to base</span>
    <span class="ruby-identifier">exponent</span> = <span class="ruby-identifier">max_exp</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">exponent</span> <span class="ruby-operator">&gt;</span> <span class="ruby-identifier">max_exp</span> <span class="ruby-comment"># we need this to avoid overflow for the highest unit</span>
    <span class="ruby-identifier">number</span>  <span class="ruby-operator">/=</span> <span class="ruby-identifier">base</span> <span class="ruby-operator">**</span> <span class="ruby-identifier">exponent</span>

    <span class="ruby-identifier">unit_key</span> = <span class="ruby-constant">STORAGE_UNITS</span>[<span class="ruby-identifier">exponent</span>]
    <span class="ruby-identifier">unit</span> = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:&quot;number.human.storage_units.units.#{unit_key}&quot;</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:count</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">number</span>, <span class="ruby-value">:raise</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)

    <span class="ruby-identifier">formatted_number</span> = <span class="ruby-identifier">number_with_precision</span>(<span class="ruby-identifier">number</span>, <span class="ruby-identifier">options</span>)
    <span class="ruby-identifier">storage_units_format</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r%n/</span>, <span class="ruby-identifier">formatted_number</span>).<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">%r%u/</span>, <span class="ruby-identifier">unit</span>).<span class="ruby-identifier">html_safe</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- number_to_human_size-source -->
          
        </div>

        

        
      </div><!-- number_to_human_size-method -->

    
      <div id="method-i-number_to_percentage" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">number_to_percentage</span><span
            class="method-args">(number, options = {})</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Formats a <code>number</code> as a percentage string (e.g., 65%). You can
customize the format in the <code>options</code> hash.</p>

<h4 id="method-i-number_to_percentage-label-Options">Options</h4>
<ul><li>
<p><code>:locale</code> - Sets the locale to be used for formatting (defaults
to current locale).</p>
</li><li>
<p><code>:precision</code> - Sets the precision of the number (defaults to 3).</p>
</li><li>
<p><code>:significant</code> - If <code>true</code>, precision will be the #
of significant_digits. If <code>false</code>, the # of fractional digits
(defaults to <code>false</code>).</p>
</li><li>
<p><code>:separator</code> - Sets the separator between the fractional and
integer digits (defaults to ".").</p>
</li><li>
<p><code>:delimiter</code> - Sets the thousands delimiter (defaults to "").</p>
</li><li>
<p><code>:strip_insignificant_zeros</code> - If <code>true</code> removes
insignificant zeros after the decimal separator (defaults to
<code>false</code>).</p>
</li><li>
<p><code>:raise</code> - If true, raises <code>InvalidNumberError</code> when
the argument is invalid.</p>
</li></ul>

<h4 id="method-i-number_to_percentage-label-Examples">Examples</h4>

<pre class="ruby"><span class="ruby-identifier">number_to_percentage</span>(<span class="ruby-value">100</span>)                                        <span class="ruby-comment"># =&gt; 100.000%</span>
<span class="ruby-identifier">number_to_percentage</span>(<span class="ruby-string">&quot;98&quot;</span>)                                       <span class="ruby-comment"># =&gt; 98.000%</span>
<span class="ruby-identifier">number_to_percentage</span>(<span class="ruby-value">100</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">0</span>)                       <span class="ruby-comment"># =&gt; 100%</span>
<span class="ruby-identifier">number_to_percentage</span>(<span class="ruby-value">1000</span>, :<span class="ruby-identifier">delimiter</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">'.'</span>, :<span class="ruby-identifier">separator</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">','</span>) <span class="ruby-comment"># =&gt; 1.000,000%</span>
<span class="ruby-identifier">number_to_percentage</span>(<span class="ruby-value">302.24398923423</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">5</span>)           <span class="ruby-comment"># =&gt; 302.24399%</span>
<span class="ruby-identifier">number_to_percentage</span>(<span class="ruby-value">1000</span>, :<span class="ruby-identifier">locale</span> =<span class="ruby-operator">&gt;</span> :<span class="ruby-identifier">fr</span>)                       <span class="ruby-comment"># =&gt; 1 000,000%</span>
<span class="ruby-identifier">number_to_percentage</span>(<span class="ruby-string">&quot;98a&quot;</span>)                                      <span class="ruby-comment"># =&gt; 98a%</span>

<span class="ruby-identifier">number_to_percentage</span>(<span class="ruby-string">&quot;98a&quot;</span>, :<span class="ruby-identifier">raise</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)                      <span class="ruby-comment"># =&gt; InvalidNumberError</span>
</pre>
          

          
          <div class="method-source-code" id="number_to_percentage-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.2.7/lib/action_view/helpers/number_helper.rb, line 201</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">number_to_percentage</span>(<span class="ruby-identifier">number</span>, <span class="ruby-identifier">options</span> = {})
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">number</span>

  <span class="ruby-identifier">options</span>.<span class="ruby-identifier">symbolize_keys!</span>

  <span class="ruby-identifier">defaults</span>   = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">percentage</span> = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.percentage.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">defaults</span>  = <span class="ruby-identifier">defaults</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-identifier">percentage</span>)

  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">reverse_merge</span>(<span class="ruby-identifier">defaults</span>)

  <span class="ruby-keyword">begin</span>
    <span class="ruby-node">&quot;#{number_with_precision(number, options.merge(:raise =&gt; true))}%&quot;</span>.<span class="ruby-identifier">html_safe</span>
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">InvalidNumberError</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">e</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:raise</span>]
      <span class="ruby-identifier">raise</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">e</span>.<span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">html_safe?</span> <span class="ruby-operator">?</span> <span class="ruby-node">&quot;#{e.number}%&quot;</span>.<span class="ruby-identifier">html_safe</span> <span class="ruby-operator">:</span> <span class="ruby-node">&quot;#{e.number}%&quot;</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div><!-- number_to_percentage-source -->
          
        </div>

        

        
      </div><!-- number_to_percentage-method -->

    
      <div id="method-i-number_to_phone" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">number_to_phone</span><span
            class="method-args">(number, options = {})</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Formats a <code>number</code> into a US phone number (e.g., (555)
123-9876). You can customize the format in the <code>options</code> hash.</p>

<h4 id="method-i-number_to_phone-label-Options">Options</h4>
<ul><li>
<p><code>:area_code</code> - Adds parentheses around the area code.</p>
</li><li>
<p><code>:delimiter</code> - Specifies the delimiter to use (defaults to "-").</p>
</li><li>
<p><code>:extension</code> - Specifies an extension to add to the end of the
generated number.</p>
</li><li>
<p><code>:country_code</code> - Sets the country code for the phone number.</p>
</li><li>
<p><code>:raise</code> - If true, raises <code>InvalidNumberError</code> when
the argument is invalid.</p>
</li></ul>

<h4 id="method-i-number_to_phone-label-Examples">Examples</h4>

<pre class="ruby"><span class="ruby-identifier">number_to_phone</span>(<span class="ruby-value">5551234</span>)                                           <span class="ruby-comment"># =&gt; 555-1234</span>
<span class="ruby-identifier">number_to_phone</span>(<span class="ruby-string">&quot;5551234&quot;</span>)                                         <span class="ruby-comment"># =&gt; 555-1234</span>
<span class="ruby-identifier">number_to_phone</span>(<span class="ruby-value">1235551234</span>)                                        <span class="ruby-comment"># =&gt; 123-555-1234</span>
<span class="ruby-identifier">number_to_phone</span>(<span class="ruby-value">1235551234</span>, :<span class="ruby-identifier">area_code</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)                    <span class="ruby-comment"># =&gt; (123) 555-1234</span>
<span class="ruby-identifier">number_to_phone</span>(<span class="ruby-value">1235551234</span>, :<span class="ruby-identifier">delimiter</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot; &quot;</span>)                     <span class="ruby-comment"># =&gt; 123 555 1234</span>
<span class="ruby-identifier">number_to_phone</span>(<span class="ruby-value">1235551234</span>, :<span class="ruby-identifier">area_code</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>, :<span class="ruby-identifier">extension</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">555</span>) <span class="ruby-comment"># =&gt; (123) 555-1234 x 555</span>
<span class="ruby-identifier">number_to_phone</span>(<span class="ruby-value">1235551234</span>, :<span class="ruby-identifier">country_code</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">1</span>)                    <span class="ruby-comment"># =&gt; +1-123-555-1234</span>
<span class="ruby-identifier">number_to_phone</span>(<span class="ruby-string">&quot;123a456&quot;</span>)                                         <span class="ruby-comment"># =&gt; 123a456</span>

<span class="ruby-identifier">number_to_phone</span>(<span class="ruby-string">&quot;1234a567&quot;</span>, :<span class="ruby-identifier">raise</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)                        <span class="ruby-comment"># =&gt; InvalidNumberError</span>

<span class="ruby-identifier">number_to_phone</span>(<span class="ruby-value">1235551234</span>, :<span class="ruby-identifier">country_code</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">1</span>, :<span class="ruby-identifier">extension</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">1343</span>, :<span class="ruby-identifier">delimiter</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;.&quot;</span>)
<span class="ruby-comment"># =&gt; +1.123.555.1234 x 1343</span>
</pre>
          

          
          <div class="method-source-code" id="number_to_phone-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.2.7/lib/action_view/helpers/number_helper.rb, line 61</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">number_to_phone</span>(<span class="ruby-identifier">number</span>, <span class="ruby-identifier">options</span> = {})
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">number</span>

  <span class="ruby-keyword">begin</span>
    <span class="ruby-constant">Float</span>(<span class="ruby-identifier">number</span>)
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-constant">TypeError</span>
    <span class="ruby-identifier">raise</span> <span class="ruby-constant">InvalidNumberError</span>, <span class="ruby-identifier">number</span>
  <span class="ruby-keyword">end</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:raise</span>]

  <span class="ruby-identifier">number</span>       = <span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">strip</span>
  <span class="ruby-identifier">options</span>      = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">symbolize_keys</span>
  <span class="ruby-identifier">area_code</span>    = <span class="ruby-identifier">options</span>[<span class="ruby-value">:area_code</span>]
  <span class="ruby-identifier">delimiter</span>    = <span class="ruby-identifier">options</span>[<span class="ruby-value">:delimiter</span>] <span class="ruby-operator">||</span> <span class="ruby-string">&quot;-&quot;</span>
  <span class="ruby-identifier">extension</span>    = <span class="ruby-identifier">options</span>[<span class="ruby-value">:extension</span>]
  <span class="ruby-identifier">country_code</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:country_code</span>]

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">area_code</span>
    <span class="ruby-identifier">number</span>.<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp">%r(\d{1,3})(\d{3})(\d{4}$)/</span>,<span class="ruby-node">&quot;(\\1) \\2#{delimiter}\\3&quot;</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">number</span>.<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp">%r(\d{0,3})(\d{3})(\d{4})$/</span>,<span class="ruby-node">&quot;\\1#{delimiter}\\2#{delimiter}\\3&quot;</span>)
    <span class="ruby-identifier">number</span>.<span class="ruby-identifier">slice!</span>(<span class="ruby-value">0</span>, <span class="ruby-value">1</span>) <span class="ruby-keyword">if</span> <span class="ruby-identifier">number</span>.<span class="ruby-identifier">starts_with?</span>(<span class="ruby-identifier">delimiter</span>) <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-operator">!</span><span class="ruby-identifier">delimiter</span>.<span class="ruby-identifier">blank?</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">str</span> = []
  <span class="ruby-identifier">str</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-node">&quot;+#{country_code}#{delimiter}&quot;</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">country_code</span>.<span class="ruby-identifier">blank?</span>
  <span class="ruby-identifier">str</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">number</span>
  <span class="ruby-identifier">str</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-node">&quot; x #{extension}&quot;</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">extension</span>.<span class="ruby-identifier">blank?</span>
  <span class="ruby-constant">ERB</span><span class="ruby-operator">::</span><span class="ruby-constant">Util</span>.<span class="ruby-identifier">html_escape</span>(<span class="ruby-identifier">str</span>.<span class="ruby-identifier">join</span>)
<span class="ruby-keyword">end</span></pre>
          </div><!-- number_to_phone-source -->
          
        </div>

        

        
      </div><!-- number_to_phone-method -->

    
      <div id="method-i-number_with_delimiter" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">number_with_delimiter</span><span
            class="method-args">(number, options = {})</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Formats a <code>number</code> with grouped thousands using
<code>delimiter</code> (e.g., 12,324). You can customize the format in the
<code>options</code> hash.</p>

<h4 id="method-i-number_with_delimiter-label-Options">Options</h4>
<ul><li>
<p><code>:locale</code> - Sets the locale to be used for formatting (defaults
to current locale).</p>
</li><li>
<p><code>:delimiter</code> - Sets the thousands delimiter (defaults to ",").</p>
</li><li>
<p><code>:separator</code> - Sets the separator between the fractional and
integer digits (defaults to ".").</p>
</li><li>
<p><code>:raise</code> - If true, raises <code>InvalidNumberError</code> when
the argument is invalid.</p>
</li></ul>

<h4 id="method-i-number_with_delimiter-label-Examples">Examples</h4>

<pre class="ruby"><span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-value">12345678</span>)                        <span class="ruby-comment"># =&gt; 12,345,678</span>
<span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-string">&quot;123456&quot;</span>)                        <span class="ruby-comment"># =&gt; 123,456</span>
<span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-value">12345678.05</span>)                     <span class="ruby-comment"># =&gt; 12,345,678.05</span>
<span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-value">12345678</span>, :<span class="ruby-identifier">delimiter</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;.&quot;</span>)     <span class="ruby-comment"># =&gt; 12.345.678</span>
<span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-value">12345678</span>, :<span class="ruby-identifier">delimiter</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;,&quot;</span>)     <span class="ruby-comment"># =&gt; 12,345,678</span>
<span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-value">12345678.05</span>, :<span class="ruby-identifier">separator</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot; &quot;</span>)  <span class="ruby-comment"># =&gt; 12,345,678 05</span>
<span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-value">12345678.05</span>, :<span class="ruby-identifier">locale</span> =<span class="ruby-operator">&gt;</span> :<span class="ruby-identifier">fr</span>)     <span class="ruby-comment"># =&gt; 12 345 678,05</span>
<span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-string">&quot;112a&quot;</span>)                          <span class="ruby-comment"># =&gt; 112a</span>
<span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-value">98765432.98</span>, :<span class="ruby-identifier">delimiter</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot; &quot;</span>, :<span class="ruby-identifier">separator</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">&quot;,&quot;</span>)
<span class="ruby-comment"># =&gt; 98 765 432,98</span>

<span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-string">&quot;112a&quot;</span>, :<span class="ruby-identifier">raise</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)          <span class="ruby-comment"># =&gt; raise InvalidNumberError</span>
</pre>
          

          
          <div class="method-source-code" id="number_with_delimiter-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.2.7/lib/action_view/helpers/number_helper.rb, line 252</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-identifier">number</span>, <span class="ruby-identifier">options</span> = {})
  <span class="ruby-identifier">options</span>.<span class="ruby-identifier">symbolize_keys!</span>

  <span class="ruby-keyword">begin</span>
    <span class="ruby-constant">Float</span>(<span class="ruby-identifier">number</span>)
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-constant">TypeError</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:raise</span>]
      <span class="ruby-identifier">raise</span> <span class="ruby-constant">InvalidNumberError</span>, <span class="ruby-identifier">number</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-keyword">return</span> <span class="ruby-identifier">number</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">defaults</span> = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">reverse_merge</span>(<span class="ruby-identifier">defaults</span>)

  <span class="ruby-identifier">parts</span> = <span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">to_str</span>.<span class="ruby-identifier">split</span>(<span class="ruby-string">'.'</span>)
  <span class="ruby-identifier">parts</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">gsub!</span>(<span class="ruby-regexp">%r(\d)(?=(\d\d\d)+(?!\d))/</span>, <span class="ruby-node">&quot;\\1#{options[:delimiter]}&quot;</span>)
  <span class="ruby-identifier">parts</span>.<span class="ruby-identifier">join</span>(<span class="ruby-identifier">options</span>[<span class="ruby-value">:separator</span>]).<span class="ruby-identifier">html_safe</span>

<span class="ruby-keyword">end</span></pre>
          </div><!-- number_with_delimiter-source -->
          
        </div>

        

        
      </div><!-- number_with_delimiter-method -->

    
      <div id="method-i-number_with_precision" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">number_with_precision</span><span
            class="method-args">(number, options = {})</span>
          <span class="method-click-advice">click to toggle source</span>
        </div>
        

        <div class="method-description">
          
          <p>Formats a <code>number</code> with the specified level of
<code>:precision</code> (e.g., 112.32 has a precision of 2 if
<code>:significant</code> is <code>false</code>, and 5 if
<code>:significant</code> is <code>true</code>). You can customize the
format in the <code>options</code> hash.</p>

<h4 id="method-i-number_with_precision-label-Options">Options</h4>
<ul><li>
<p><code>:locale</code> - Sets the locale to be used for formatting (defaults
to current locale).</p>
</li><li>
<p><code>:precision</code> - Sets the precision of the number (defaults to 3).</p>
</li><li>
<p><code>:significant</code> - If <code>true</code>, precision will be the #
of significant_digits. If <code>false</code>, the # of fractional digits
(defaults to <code>false</code>).</p>
</li><li>
<p><code>:separator</code> - Sets the separator between the fractional and
integer digits (defaults to ".").</p>
</li><li>
<p><code>:delimiter</code> - Sets the thousands delimiter (defaults to "").</p>
</li><li>
<p><code>:strip_insignificant_zeros</code> - If <code>true</code> removes
insignificant zeros after the decimal separator (defaults to
<code>false</code>).</p>
</li><li>
<p><code>:raise</code> - If true, raises <code>InvalidNumberError</code> when
the argument is invalid.</p>
</li></ul>

<h4 id="method-i-number_with_precision-label-Examples">Examples</h4>

<pre class="ruby"><span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">111.2345</span>)                                            <span class="ruby-comment"># =&gt; 111.235</span>
<span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">111.2345</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">2</span>)                           <span class="ruby-comment"># =&gt; 111.23</span>
<span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">13</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">5</span>)                                 <span class="ruby-comment"># =&gt; 13.00000</span>
<span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">389.32314</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">0</span>)                          <span class="ruby-comment"># =&gt; 389</span>
<span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">111.2345</span>, :<span class="ruby-identifier">significant</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)                      <span class="ruby-comment"># =&gt; 111</span>
<span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">111.2345</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">1</span>, :<span class="ruby-identifier">significant</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)     <span class="ruby-comment"># =&gt; 100</span>
<span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">13</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">5</span>, :<span class="ruby-identifier">significant</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)           <span class="ruby-comment"># =&gt; 13.000</span>
<span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">111.234</span>, :<span class="ruby-identifier">locale</span> =<span class="ruby-operator">&gt;</span> :<span class="ruby-identifier">fr</span>)                             <span class="ruby-comment"># =&gt; 111,234</span>

<span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">13</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">5</span>, :<span class="ruby-identifier">significant</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>, :<span class="ruby-identifier">strip_insignificant_zeros</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)
<span class="ruby-comment"># =&gt; 13</span>

<span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">389.32314</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">4</span>, :<span class="ruby-identifier">significant</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-keyword">true</span>)    <span class="ruby-comment"># =&gt; 389.3</span>
<span class="ruby-identifier">number_with_precision</span>(<span class="ruby-value">1111.2345</span>, :<span class="ruby-identifier">precision</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value">2</span>, :<span class="ruby-identifier">separator</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">','</span>, :<span class="ruby-identifier">delimiter</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-string">'.'</span>)
<span class="ruby-comment"># =&gt; 1.111,23</span>
</pre>
          

          
          <div class="method-source-code" id="number_with_precision-source">
            <pre><span class="ruby-comment"># File /usr/local/lib/ruby/gems/1.9.1/gems/actionpack-3.2.7/lib/action_view/helpers/number_helper.rb, line 315</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">number_with_precision</span>(<span class="ruby-identifier">number</span>, <span class="ruby-identifier">options</span> = {})
  <span class="ruby-identifier">options</span>.<span class="ruby-identifier">symbolize_keys!</span>

  <span class="ruby-identifier">number</span> = <span class="ruby-keyword">begin</span>
    <span class="ruby-constant">Float</span>(<span class="ruby-identifier">number</span>)
  <span class="ruby-keyword">rescue</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-constant">TypeError</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:raise</span>]
      <span class="ruby-identifier">raise</span> <span class="ruby-constant">InvalidNumberError</span>, <span class="ruby-identifier">number</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-keyword">return</span> <span class="ruby-identifier">number</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">defaults</span>           = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">precision_defaults</span> = <span class="ruby-constant">I18n</span>.<span class="ruby-identifier">translate</span>(<span class="ruby-value">:'number.precision.format'</span>, <span class="ruby-value">:locale</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:locale</span>], <span class="ruby-value">:default</span> =<span class="ruby-operator">&gt;</span> {})
  <span class="ruby-identifier">defaults</span>           = <span class="ruby-identifier">defaults</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-identifier">precision_defaults</span>)

  <span class="ruby-identifier">options</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">reverse_merge</span>(<span class="ruby-identifier">defaults</span>)  <span class="ruby-comment"># Allow the user to unset default values: Eg.: :significant =&gt; false</span>
  <span class="ruby-identifier">precision</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">delete</span> <span class="ruby-value">:precision</span>
  <span class="ruby-identifier">significant</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">delete</span> <span class="ruby-value">:significant</span>
  <span class="ruby-identifier">strip_insignificant_zeros</span> = <span class="ruby-identifier">options</span>.<span class="ruby-identifier">delete</span> <span class="ruby-value">:strip_insignificant_zeros</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">significant</span> <span class="ruby-keyword">and</span> <span class="ruby-identifier">precision</span> <span class="ruby-operator">&gt;</span> <span class="ruby-value">0</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">number</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>
      <span class="ruby-identifier">digits</span>, <span class="ruby-identifier">rounded_number</span> = <span class="ruby-value">1</span>, <span class="ruby-value">0</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">digits</span> = (<span class="ruby-constant">Math</span>.<span class="ruby-identifier">log10</span>(<span class="ruby-identifier">number</span>.<span class="ruby-identifier">abs</span>) <span class="ruby-operator">+</span> <span class="ruby-value">1</span>).<span class="ruby-identifier">floor</span>
      <span class="ruby-identifier">rounded_number</span> = (<span class="ruby-constant">BigDecimal</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_s</span>) <span class="ruby-operator">/</span> <span class="ruby-constant">BigDecimal</span>.<span class="ruby-identifier">new</span>((<span class="ruby-value">10</span> <span class="ruby-operator">**</span> (<span class="ruby-identifier">digits</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">precision</span>)).<span class="ruby-identifier">to_f</span>.<span class="ruby-identifier">to_s</span>)).<span class="ruby-identifier">round</span>.<span class="ruby-identifier">to_f</span> * <span class="ruby-value">10</span> <span class="ruby-operator">**</span> (<span class="ruby-identifier">digits</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">precision</span>)
      <span class="ruby-identifier">digits</span> = (<span class="ruby-constant">Math</span>.<span class="ruby-identifier">log10</span>(<span class="ruby-identifier">rounded_number</span>.<span class="ruby-identifier">abs</span>) <span class="ruby-operator">+</span> <span class="ruby-value">1</span>).<span class="ruby-identifier">floor</span> <span class="ruby-comment"># After rounding, the number of digits may have changed</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">precision</span> <span class="ruby-operator">-=</span> <span class="ruby-identifier">digits</span>
    <span class="ruby-identifier">precision</span> = <span class="ruby-identifier">precision</span> <span class="ruby-operator">&gt;</span> <span class="ruby-value">0</span> <span class="ruby-operator">?</span> <span class="ruby-identifier">precision</span> <span class="ruby-operator">:</span> <span class="ruby-value">0</span>  <span class="ruby-comment">#don't let it be negative</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">rounded_number</span> = <span class="ruby-constant">BigDecimal</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">number</span>.<span class="ruby-identifier">to_s</span>).<span class="ruby-identifier">round</span>(<span class="ruby-identifier">precision</span>).<span class="ruby-identifier">to_f</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">formatted_number</span> = <span class="ruby-identifier">number_with_delimiter</span>(<span class="ruby-node">&quot;%01.#{precision}f&quot;</span> <span class="ruby-operator">%</span> <span class="ruby-identifier">rounded_number</span>, <span class="ruby-identifier">options</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">strip_insignificant_zeros</span>
    <span class="ruby-identifier">escaped_separator</span> = <span class="ruby-constant">Regexp</span>.<span class="ruby-identifier">escape</span>(<span class="ruby-identifier">options</span>[<span class="ruby-value">:separator</span>])
    <span class="ruby-identifier">formatted_number</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-node">%r(#{escaped_separator})(\d*[1-9])?0+\z/</span>, <span class="ruby-string">'\1\2'</span>).<span class="ruby-identifier">sub</span>(<span class="ruby-node">%r#{escaped_separator}\z/</span>, <span class="ruby-string">''</span>).<span class="ruby-identifier">html_safe</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">formatted_number</span>
  <span class="ruby-keyword">end</span>

<span class="ruby-keyword">end</span></pre>
          </div><!-- number_with_precision-source -->
          
        </div>

        

        
      </div><!-- number_with_precision-method -->

    
    </section><!-- public-instance-method-details -->
  
  </section><!-- 5Buntitled-5D -->

</div><!-- documentation -->


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